coda is stiffer, directional-twin rather than true twin, and different tips (not sure what the difference here is but I think the BL/WM are more blunted shape, there may be other differences too though).

The blacklist is also a midwide, and from what people say, it goes BL/WM/CODA in terms of flex. Coda being the stiffest, but not stiff by any means.

Honestly, if you can't 5-0 the Westmark, you shouldn't be worried about the differences between the Blacklist and it. Grab whichever one you can find in your size unless you are truly limited by boot size. As in like maybe less than 8.5 (probably stick to Westmark) or bigger than 11.5 (stick to BL). Other than that, if you want a true all-mountain board (especially if you ride lots of deep powder) the Coda will be a better board.

If you ride nothing but low speed jibs and S/M jumps, the Draft is an option.